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Azman, N. S. H.
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article
The synergistic effect of iron cobaltite compare to its single oxides as cathode in supercapacitor
Abstract
<p>Mixed transition metal oxides have attracted great attention in supercapacitors applications due to their better electrochemical performance than their single oxides. In this work, iron cobaltite (FeCo<sub>2</sub>O<sub>4</sub>) and its single metal oxides i.e. iron oxide (Fe<sub>2</sub>O<sub>3</sub>) and cobalt oxide (Co<sub>3</sub>O<sub>4</sub>) were synthesized by a simple hydrothermal process. The structural, spectroscopic and morphological properties were studied using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and field-emission scanning electron microscope (FESEM). XRD and FTIR results show the composition of the products. The obtained iron oxide was α-Fe<sub>2</sub>O<sub>3</sub>. FESEM images show that FeCo<sub>2</sub>O<sub>4</sub> and its single metal oxides exhibit different morphology even though they were synthesized via similar method. The electrochemical properties of the α-Fe<sub>2</sub>O<sub>3</sub>, Co<sub>3</sub>O<sub>4</sub> and FeCo<sub>2</sub>O<sub>4</sub> electrodes were examined by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) in a 6 M KOH electrolyte solution. At comparable current density, the FeCo<sub>2</sub>O<sub>4</sub> electrode has the highest specific capacitance (C<sub>sp</sub>), followed by Co<sub>3</sub>O<sub>4</sub> and α-Fe<sub>2</sub>O<sub>3</sub>. An asymmetric FeCo<sub>2</sub>O<sub>4</sub>/KOH/GO supercapacitor was fabricated. The supercapacitor exhibits maximum energy density of 14.5 Wh kg<sup>−1</sup> and maximum power density of 2177 W kg<sup>−1</sup>. It demonstrates 60% rate capability after 1000 continuous charge-discharge cycles at 1 A g<sup>−1</sup>.</p>